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Steel Making

Flange Shields For Furnaces
Such portable flame shields as the one illustrated in Fig. 1...

Carburizing Low-carbon Sleeves
Low-carbon sleeves are carburized and pushed on malleable-ir...

For Milling Cutters And Formed Tools
FORGING.--Forge as before.--ANNEALING.--Place the steel in a ...

Heat Treatment Of Steel
Heat treatment consists in heating and cooling metal at defin...

Temperatures To Use
As soon as the temperature of the steel reaches 100 deg.C. (...

Tempering Colors On Carbon Steels
Opinions differ as to the temperature which is indicated by t...

The Pyrometer And Its Use
In the heat treatment of steel, it has become absolutely nece...

Placing The Thermo-couples
The following illustrations from the Taylor Instrument Compan...

Introduction Of Carbon
The matter to which these notes are primarily directed is the...

Carbon Tool Steel
Heat to a bright red, about 1,500 to 1,550 deg.F. Do not ham...

Heat-treating Equipment And Methods For Mass Production
The heat-treating department of the Brown-Lipe-Chapin Company...

Silicon
SILICON is a very widespread element (symbol Si), being an es...

Making Steel Balls
Steel balls are made from rods or coils according to size, st...

Standard Analysis
The selection of a standard analysis by the manufacturer is t...

William Kelly's Air-boiling Process
An account of Bessemer's address to the British Association w...

Classifications Of Steel
Among makers and sellers, carbon tool-steels are classed by g...

Conclusions
Martien was probably never a serious contender for the honor ...

Temperature Recording And Regulation
Each furnace is equipped with pyrometers, but the reading an...

Nickel
Nickel may be considered as the toughest among the non-rare a...

Mushet And Bessemer
That Mushet was "used" by Ebbw Vale against Bessemer is, perh...



An Automatic Temperature Control Pyrometer






Category: PYROMETRY AND PYROMETERS

Automatic temperature control instruments are similar to the Brown
indicating high resistance pyrometer with the exception that the
pointer is depressed at intervals of every 10 sec. upon contact-making
devices. No current passes through the pointer which simply depresses
the upper contact device tipped with platinum, which in turn comes
in contact with the lower contact device, platinum-tipped, and the
circuit is completed through these two contacts. The current is very
small, about 1/10 amp., as it is only necessary to operate the relay
which in turn operates the switch or valve. A small motor is used to
depress the pointer at regular intervals. The contact-making device
is adjustable throughout the scale range of the instrument, and an
index pointer indicates the point on the instrument at which the
temperature is being controlled. The space between the two contacts
on the high and low side, separated by insulating material, is
equivalent to 1 per cent of the scale range. A control of temperature
is therefore possible within 1 per cent of the total scale range.
Figure 131 shows this attached to a small furnace.





Next: Pyrometers For Molten Metal

Previous: Brown Automatic Signaling Pyrometer



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